Guard for pneumatic hammers.



H. N. EVANS, Sn. GUARD FORYPNEUMATIG HAMMERS.

APPLICATION FILED MAY 7, 1913.

Patented Feb.3, 1914.

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ATENT OFFICE.

EVANS, $13.. OF PHILADELPHIA, PENNSYLVANIA.

GUARD FOR PNEUMATIC HAMMERS.

Specification of Letters Patent. Application filed May 7, 1913.

Patented Feb. 3,1914.

Serial No. 766,038.

phia and State of Pennsylvania, have invented certain new and usefulImprovements in Guards for Pneumatic Hammers, of which the following isa specification.

My invention relates to improvements in guards for pneumatic hammers,the object of the invention being to provide a guard which connects therivet set with the handle of the hammer so as to prevent any possibilityof the rivet set and the plunger being accidentally blown out of thehammer.

A further object is to provide an improved guard of this character whichis adapted for use in connection with a closed handle or a revolverhandle, and which embodies the maximum of strength and durability.

With these and other objects in view, the invention consists in certainnovel features of construction and combinations and arrangements ofparts as will be more fully hereinafter described and pointed out in theclaims.

In the accompanying drawings: Figure 1 is a view in side elevationillustrating in full lines a pneumatic hammer of the closed handle typeshowing my improvements thereon and illustrating in dotted lines ahandle of the revolver type. Fig. 2 is a plan view of my improved guardremeved. Fig. 3 is a fragmentary view in longitudinal section on anenlarged scale on the line 3 3 of Fig. 2. Fig. 4 is a ew in crosssection on an enlarged scale on the line 4 -4 of Fig. 2, and Fig. 5 is afragmentary view in longitudinal section through the handle engagingloop of the guard.

1 represents an ordinary pneumatic hammer having a removable rivet set 2in one end, and provided with 3 at its other end.

Many hammers in general use have what are known as closed handles suchas illustrated in full lines in Fig. 1, and others have what are knownas revolver handles illustrated in dotted lines in Fig. 1, and myimprovements are adapted for use in connection with either style ofhandle.

Rivet sets 2 are ordinarily provided with annular grooves 4 in which awire 5 is clamped by means of a bar 6. The ends of wire 5 are flaredoutwardly forming hooks an ordinary handle 7' and they are projectedthrough a slot 8 in bar 6. By reason of the shape of this slot 8. thehooked ends of the wire may be readily inserted when the bar is inalinement with the wire, but when the bar is moved to position at rightangles to the wire, which is its operative position, the wire will beclamped around the rivet set as will be readily understood.

The bar 6 is provided with a slot 22 to receive a hooked end v23 of arod9. This rod 9 projects through one end 10 of a coupling mem er 11. Thiscoupling member 11 comprises a bar of spring metal bent at two pointsbetween its ends as shown at 1.2 forming the end 10 above referred to,and the two portions of said strip then extend in substantialparallelism for the desired distance. forming twobars 13. 13, which attheir rear ends are curved as shown at 14 and 15 respectively forming aloop to engage the handle of the tool.

The member 15 is provided with a slot 16 through which a hook 17 onmember 14 isadapted to spring, so that by pressing the members 14 and 15toward each other, the hook 17 may be removed from the slot 16 and theloop may be opened, so that it may be readily inserted on a handle 3 ofthe closed type, and then the parts sprung into locked engagement asshown in Fig. 5.

The rod 9 above referred to as projecting through the end 10, alsoextends through a guide plate 18 and is screw-threaded at its end toreceive a nut 19 against said plate 18. The plate 18 is provided with aslot 20 receiving one bar 13-and guided thereon.

A coiled spring 21 is located around rod 9 between plate 18 and the'end10, so that it exerts a constant pressure on the rod tending to move thesame toward the handle. This spring furthermore operates as a cushioningmedium which prevents any breakage of the parts in the event air isturned on,

because it elastically holds the parts together, yet prevents anypossibility of the rivet set being blown entirely out of the hammer.

My improvements may be readily assembled on the hammer and adjusted tofit various sizes of hammer by turning nut 19.

Various slight changes might be made in the general formand arrangementof parts describedwithoutdeparting from my invention, and hence I do notlimit myself to the precise details set forth, but consider my:

self at liberty to make such changes and al= wrations as fairly fallwithin the spirit and scope of the appended claims.

llaring thus described my invention, what i claim as new and desire tosecure by Letters Patent is:

1. A guard for pneumatic hammers, comprising a metal .strap bent betweenits ends, and at its ends detachably connected and forming a handleengaging loop, a rod movable through the other end of the strap andextending between the members of the strap, a device on the rod guidedon the strap, a spring around the rod exerting rearward pressure on saiddevice, and means connccting the rod to a rivet set, substantially asdescribed.

2. A guard for pneumatic hammers, comprising a metal strap bent betweenits ends, and at; its ends detachably connected and 'lorining a handleengaging loop, a rod movable through the other end of the strap andextending between the members of the strap, a device on the rod guidedon the strap, a spring around the rod exerting rearward pressure on saiddevice, a hook on said rod, and a bar secured to a rivet set anddetachably connected to said hook, substantially as described.

3. A guard for pneumatic hammers, comprising a metal strap bent betweenits ends, and at its ends detachably connected and forming a handleengaging loop, a rod movable through the other end of the strap andnoeaeee set, substantially as described.

around the rod be 4-. A guard for pneumatic hammers, comprising a metalstrap constituting a coupling member having parallel bars, and a handlereceiving-loop at the free ends of said bars, said strap being of springmetal and constructed to look about the handle, a plate having a slotmounted to slide on one of said bars, a rod projecting through the otherend of the coupling member and through said plate, a nut screwed on saidrod against the plate, a coiled spring around the rod between the plateand the end of the coupling member, a hook on the end of said rod, andmeans detachably connected to said hook and adapted to be secured to arivet set, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HARRY N. EVANS, SR.

Witnesses:

CHAS. E. lPor'rs, MARY E. DI'I'IUS.

